article: 0ur village carpenter ,John Hill, came one day and made a dining table for my wife.  He made it just the right size to fill the space between the two window.  When I got home that evening, John was drinking a cup of tea and writing out his bill( ) for his job.
  My wife said to me quietly, "That's his ninth cup of tea today. "But she said in a loud voice, "It's a beautiful table, dear, isn't it?" "I'll decide about that when I see the bill," I said.  John laughed and gave me his bill for the work.  I read:
  One dining table                 10thNovember, 2011
  Cost of wood                    $ 17:00
  Paint                           $1. 50
  Work, 8 hours($1 an hour)          $8. 00
  Total                           $36. 50
  When I was looking at the bill, John said," It's been a fine day, hasn't it? Quite sunny. "
  "Yes," I said.  "I'm glad it's only the 10thof November. "
  "Me, too," said John, "you wait--it will be a lot colder by the end of the month. "
  "Yes, colder--and more expensive! Dining table will be $20 more expensive on November 30th, won't they, John?"
  John looked hard at me for half a minute.  Was there a little smile in his two blue eyes? I gave his bill back to him.
  "If it's not too much trouble, John," I said,"Please add  it up again, You can forget the date-------"
  I paid him $26. 50 and he was happy to get it.
question: Why did John talk about the weather when the writer was looking at the bill?
options: Because he didn't want the writer to check the bill carefully. Because he wanted to show that he was really polite. Because it's a good way to communicate with each other. Because he wanted to confirm what the weather was like.